// ECMA 15.10.4
JSObject* constructRegExp(ExecState* exec, JSGlobalObject* globalObject, const ArgList& args, JSValue newTarget)
{
JSValue arg0 = args.at(0);
JSValue arg1 = args.at(1);
if (arg0.inherits(RegExpObject::info())) {
if (!arg1.isUndefined())
return exec->vm().throwException(exec, createTypeError(exec, ASCIILiteral("Cannot supply flags when constructing one RegExp from another.")));
// If called as a function, this just returns the first argument (see 15.10.3.1).
if (newTarget != jsUndefined()) {
RegExp* regExp = static_cast<RegExpObject*>(asObject(arg0))->regExp();
return RegExpObject::create(exec->vm(), getRegExpStructure(exec, globalObject, newTarget), regExp);
}
return asObject(arg0);
}
String pattern = arg0.isUndefined() ? emptyString() : arg0.toString(exec)->value(exec);
if (exec->hadException())
return 0;
RegExpFlags flags = NoFlags;
if (!arg1.isUndefined()) {
flags = regExpFlags(arg1.toString(exec)->value(exec));
if (exec->hadException())
return 0;
if (flags == InvalidFlags)
return exec->vm().throwException(exec, createSyntaxError(exec, ASCIILiteral("Invalid flags supplied to RegExp constructor.")));
}
VM& vm = exec->vm();
RegExp* regExp = RegExp::create(vm, pattern, flags);
if (!regExp->isValid())
return vm.throwException(exec, createSyntaxError(exec, regExp->errorMessage()));
return RegExpObject::create(vm, getRegExpStructure(exec, globalObject, newTarget), regExp);
}
JSObject* constructRegExp(ExecState* exec, JSGlobalObject* globalObject, const ArgList& args, JSObject* callee, JSValue newTarget)
{
VM& vm = exec->vm();
auto scope = DECLARE_THROW_SCOPE(vm);
JSValue patternArg = args.at(0);
JSValue flagsArg = args.at(1);
bool isPatternRegExp = patternArg.inherits(vm, RegExpObject::info());
bool constructAsRegexp = isRegExp(vm, exec, patternArg);
RETURN_IF_EXCEPTION(scope, nullptr);
if (newTarget.isUndefined() && constructAsRegexp && flagsArg.isUndefined()) {
JSValue constructor = patternArg.get(exec, vm.propertyNames->constructor);
RETURN_IF_EXCEPTION(scope, nullptr);
if (callee == constructor) {
// We know that patternArg is a object otherwise constructAsRegexp would be false.
return patternArg.getObject();
}
}
if (isPatternRegExp) {
RegExp* regExp = jsCast<RegExpObject*>(patternArg)->regExp();
Structure* structure = getRegExpStructure(exec, globalObject, newTarget);
RETURN_IF_EXCEPTION(scope, nullptr);
if (!flagsArg.isUndefined()) {
RegExpFlags flags = toFlags(exec, flagsArg);
ASSERT(!!scope.exception() == (flags == InvalidFlags));
if (flags == InvalidFlags)
return nullptr;
regExp = RegExp::create(vm, regExp->pattern(), flags);
}
return RegExpObject::create(vm, structure, regExp);
}
if (constructAsRegexp) {
JSValue pattern = patternArg.get(exec, vm.propertyNames->source);
RETURN_IF_EXCEPTION(scope, nullptr);
if (flagsArg.isUndefined()) {
flagsArg = patternArg.get(exec, vm.propertyNames->flags);
RETURN_IF_EXCEPTION(scope, nullptr);
}
patternArg = pattern;
}
scope.release();
return regExpCreate(exec, globalObject, newTarget, patternArg, flagsArg);
}
static JSObject* regExpCreate(ExecState* exec, JSGlobalObject* globalObject, JSValue newTarget, JSValue patternArg, JSValue flagsArg)
{
VM& vm = exec->vm();
String pattern = patternArg.isUndefined() ? emptyString() : patternArg.toString(exec)->value(exec);
if (exec->hadException())
return nullptr;
RegExpFlags flags = toFlags(exec, flagsArg);
if (flags == InvalidFlags)
return nullptr;
RegExp* regExp = RegExp::create(vm, pattern, flags);
if (!regExp->isValid())
return vm.throwException(exec, createSyntaxError(exec, regExp->errorMessage()));
Structure* structure = getRegExpStructure(exec, globalObject, newTarget);
if (vm.exception())
return nullptr;
return RegExpObject::create(vm, structure, regExp);
}
static JSObject* regExpCreate(ExecState* exec, JSGlobalObject* globalObject, JSValue newTarget, JSValue patternArg, JSValue flagsArg)
{
VM& vm = exec->vm();
auto scope = DECLARE_THROW_SCOPE(vm);
String pattern = patternArg.isUndefined() ? emptyString() : patternArg.toWTFString(exec);
RETURN_IF_EXCEPTION(scope, nullptr);
RegExpFlags flags = toFlags(exec, flagsArg);
ASSERT(!!scope.exception() == (flags == InvalidFlags));
if (UNLIKELY(flags == InvalidFlags))
return nullptr;
RegExp* regExp = RegExp::create(vm, pattern, flags);
if (!regExp->isValid())
return throwException(exec, scope, createSyntaxError(exec, regExp->errorMessage()));
Structure* structure = getRegExpStructure(exec, globalObject, newTarget);
RETURN_IF_EXCEPTION(scope, nullptr);
return RegExpObject::create(vm, structure, regExp);
}